docbrown/docs/tests/unit-functional-tests.md

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Unit and Functional Tests

Unit and Functional Tests

A unit test is about testing a single function/method in isolation with all of its possible outputs.

A functional test is about testing a single functionality, which can span multiple methods and a controller.

Other common terms in Rails are "model tests," "controller tests," and others.

You can find model tests in spec/models, controller tests in spec/controllers and additional functional tests in various directories within the spec directory.

You can run all models tests, for example, with:

bundle exec rspec spec/models

To run an individual file you can use, for example:

bundle exec rspec spec/models/user_spec.rb

To run a specific test case you can use, for example:

bundle exec rspec spec/models/user_spec.rb:10

where 10 is the line number of the test case that you want to execute.

You can read the official guide Testing Rails Applications to learn more.